Hossein Amir-Abdollahian to depart Tuesday as negotiations on revised accord stall over Kremlin's insistence that Ukraine sanctions not hinder its trade with Tehran

Iranian top diplomat accuses US of making new demands for nuclear talks and complicating negotiations in Vienna

Raisi appears to defend Vienna negotiations while country's top diplomat and a security official points finger at US for deadlock, saying Washington making unreasonable proposals

Foreign Minister Amir-Abdollahian says ready to 'immediately conclude a good deal' if Western parties show 'real will'

But after blaming West, Tehran too urges political solution to burgeoning conflict

As agreement seems to come together, Iranian top diplomat says Tehran won't give up its 'red lines' in negotiations

Foreign minister tells CNN that Western powers need to be 'realistic' but Tehran is serious about wanting to reach an agreement

French foreign minister says Iran has a 'clear choice' in the coming days; Tehran says it wants to see US Congress issue statement on commitment to possible agreement

Foreign minister tells Financial Times that 'as a matter of principle' Iranians don't trust the words of any head of state, and in particular US president

Speaking alongside visiting Irish minister, Iranian top diplomat accuses West of 'tampering with text and playing for time' in talks; calls for full removal of sanctions